My *2kW* Drake balun has a polycarbonate frame around the toroid to support the
bare wire off the toroid. Bare wire cools better, particularly when suspended
off the toroid like this.
David
G3UNA
>
> From: "Gary Hinson" <Gary@isect.com>
> Date: 2008/07/29 Tue AM 03:18:43 BST
> To: <amps@contesting.com>
> CC: 'Rich Schmuke' <rdj@wildblue.net>
> Subject: Re: [Amps] Wire
>
> > I often see a note about the use of Teflon wire for baluns .
> > Does any know
> > a reason why TefzelR ETFE insulated wire would not be as
> > good or better
> > because the dielectric strength is even higher and the main
> > reason it I
> > have some wire on hand. Ref wire type M22759/16 (12ga)
>
> Hi Rich.
>
> There *may* be some cunning impedence reason but my guess is that the main
> driver for using Teflon insulated wire is good HV insulation coupled with
> low diameter.
>
> Personally, I find the stripped out inner conductor line from strag ends of
> decent coax to be more than adequate for mine. And free.
>
> Mechanical strength and water resistance of the whole job is far more
> important to me than the RF performance. Corrosion and mechanical stress
> kills my baluns, not the wrong kind of insulation. Mind you, I do use
> appropriate size and types of core given the power level and band.
>
> 73,
> Gary ZL2!FB
>
> http://www.g4ifb.com/html/homebrew.html
>
>
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> http://lists.contesting.com/mailman/listinfo/amps
>
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